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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5d0fc0702b2f024f0e4773d215c19957254d0559f2e14c521d5f0c4137d933' 
  AND token = '7fPJNnY/Og5Kifp8w+RAYbP8WK4Dpka2i994ardyoVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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