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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546df0bda119041dd91334c216cdaf0be94fcadf59e34cab2d38be5b034a7e0c' 
  AND token = 'AHr/kBmQLNu/GuIlf0e8CHURqKkxxnBQ3K+I78E2R0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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