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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e65c8c78e289ec91ac4bb68b8a8f4bfe3cb44afc6a6fd23d6096571684e1f6' 
  AND token = 'EpZlg3fSh32y3ULZTw6863goI5BpFS23aYcXr1uUn80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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