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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7aa1502171e4e5b6f3c1b46d691c16abd528d512fc0efdcac2d8fbb349a97f' 
  AND token = 'Te4CnyY0sJnkzSLyIz5m8/rhlmrarCj5Ghhc9d5sC2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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