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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed1da0df1f3ce96eb03302e29d1adfbc31d5a28369a3ad1c466aa7e4594ae31' 
  AND token = 'vMnxdkuE3ldLfxnoz6cEti1/XT2i/gEhulhZfFcH0jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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