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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d22d7eaea6523eaa6bb75fda66cf2ae21f171152c2c2f6cf71516b3ca6f466a' 
  AND token = 'VBj9ABTKsl4Boqzths1bQRbMHbkV8PBMOGHZWJuPPVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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