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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27059cc973af5555def437d0d31b4970f6305598682d6a99d30fc53143fddc92' 
  AND token = 'rh/fASztqpDwFlpZ8Sg5eKb3iqqPpX25k6pQBdm/enU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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