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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbc88df0a3f221b635893c7376c699743352e7007204fbd716447b56618eeb7' 
  AND token = '2dGg7DlB8WYCQTt1kh3Lu7cB6qrBNbjGP4Wozp46Vz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}