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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebd6cec529199c166513ed03b8e7c04c972b0840ff04510df690187651718de' 
  AND token = 'Ys/4LeWwUu8rQcU7Ta1ufQCfHGTpBKQcWIqBNJv/xeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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