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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6a25106bb2bc2a7badd4d43832d96ee9c8f5152255a1fc61acee49bfc5cd13' 
  AND token = '20afZLAwlJQLAkoALpP6R5w0DJN8i6vlgNmnFxy4+RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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