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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bf26325a5d626aab9405f46a24ccc6337072a3b37dc17bf90a7c5a77ad582e' 
  AND token = 'YwBv8BE4vyegBcxydBBggbmEk10TRVwWrQAFtFkLDwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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