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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93504a87acce98cbcc032b59553149d5663db8f2c821f2cd99293e1c8c505c37' 
  AND token = 'jpbFptmQFN5hPBUufrv16B3Bd1iuexVZKTrZVtGnP/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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