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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa662434c54bb9e8d5613ea1cdde0cd396fb9409d31df5a6079252552c4352f' 
  AND token = 'hqFWwMzucMW5+0SOrl6KtenT0TiVUelJqMTl1l/BhNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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