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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c3a41ec3011d19c19a88a4af2ee6f6ce05f54a0724c5ae5e094d581260490d' 
  AND token = 'QGChvk7djZ4QMAL/CF32ic9wDujpCCDbbYYSqGRKbLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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