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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b178c0a4870a16d20304d2f0fd24fc98f539ae5156eb6ea804162c39a7a7085' 
  AND token = 'FQoQTCIqpEtBDDZ4St4waaDk6QZJ44h6HCRj++sTmRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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