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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b053fed5dc05fd9818f0c996d803dd02105465cbccb3bc09281327d9c02c1d' 
  AND token = 'PN82Z2bZW7wwNkvbOfCuZS44AB7n4RIq4TBwSgnG2KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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