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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d12feb617b5672c587e2dbfd2c5d68144937167e8b265374e3b1210def5a03' 
  AND token = 'l8HvTXWXv9BrhMihQk9BVTO/vuCgF91noN9o52OYs4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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