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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb25af1e4a48d775b926df4f74ce32dedcf5a80c4247b125609f7a8a2905e847' 
  AND token = '1YY+nY0etYmyl5lyCMounIIrkrFmJHso5+LILFDurEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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