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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e356913156d53aa63f9f9d4dcf09bae2b6661c82e59abeab558c64b06269c8e9' 
  AND token = '5wTnj7xO7lyJsGMSFNwbq8daBn2HmPe05QSzybHOnUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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