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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e1c83ed33098e4e115f6094b32bf1891d92295fa2ed4e4ffc134e8f4178153' 
  AND token = 'uDsqUEol2WNQr8ctR2U1hwr/izhgCQMRLR1eXVMa9GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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