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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1208abcfcef66ebbbb0949949760782ba5b2f85b86f1f0cf87af842aad7e56ae' 
  AND token = 'XGjallPMxX27zxRAhL6lsNsLULjJTIX1a+cmuVgqU2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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