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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d444c81045c52fd33d4f9f8ed119a99ff8d95f4beedcf53a80dca0c5a9d22d' 
  AND token = 'wqVTgHuZK+t69ichQa6a+6BZXEfcz1X+1tq9MivNDCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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