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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667796986e9fe62a4540df738d2cce57e12ba186e9aa407cca31f839e52f2ba8' 
  AND token = 'AXbycFkIk9z+qk7MjQU5VYpCbSkBpEMqK2m0GGdUJTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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