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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783f805c83d6c8d3e37e4a0a791e0171bdd3119c7fb1ab56ade9cfc45f39f6bb' 
  AND token = '7ohk0wpS+6x3B7GmfCaff9Tbe4c0k8FFUaNymQkB8sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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