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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdce599fc71fd25d2ac1346d961789233814589f9227137879c9d9d9385d154' 
  AND token = '2Ui3u2ViwNK0qEH+A1j6p7g/9w893+lph5eNDck99eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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