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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf0afae5a25e93cc8c3890cfdb2d57179ae181380ec99b315bb7028750662b7' 
  AND token = 'RuJFU0CCUz9ogAAon8iUmmjvH+qJM116Ua93nDv39KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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