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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40f748289b42c623ae139f9b08665d470f7e1b8774b0c116d787b86afa27692' 
  AND token = '6wJoFIXVD8Dpu0/od2gdM53UJq+obR2SNFtP25RyEWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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