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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63b3b4072d0d9c0fea69efe69b3b19a0a57dcd37aee8afb0d40b5a19e79d279' 
  AND token = 'ZfX+6EP6zV/RF6LII6z0YlXHEEIwTTTS+rOd/B91Iys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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