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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d61614995c38224939b5021fc7b49a5af1baf84bf75fd33387c271c611f79c4' 
  AND token = 'ctYdkTPJMPdEQQX548QroEnzm26GVbCD/2gLiHCG4Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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