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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1b90d66f083ddb0c118c2d8213514a66afdea55a5132838df54ebb5dad6bc0' 
  AND token = 'NiWgzYVfNmGgRg4PuBh77OjoDke5fr0FNpsneC40vaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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