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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aed92037c19cb9b0a21f29209c1e8a37e84a1452c596382a02bcae6c6c16a5d' 
  AND token = 'j3xNKOAap6pX4OkhPCYOOOzry7gO2sO2vUNlJk44FMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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