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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef27b4bd4642600ea3cc5247d11b961188839082127a4a8e702db8d94852d0c' 
  AND token = 'BNuPsEiMwsNOO/x3BsqJlhlHxzGhgaTBZQBC21fs01k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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