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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0520c86445576c25d7b7397ff1bb010dd651e2ebb3e7b77203558177f2172cb9' 
  AND token = 'NV4jbnxx5rcagLfVDEuYS7TywipNbafBGsyCPuF0l/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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