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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f8cf70a7f17f4bb81b02f4219ceb4f23ac781c81d21acef83e937bc9fca096' 
  AND token = 'LB8uBpZLmv8AnAKIjk6KgE6F8zw6lU3IyN4XUkAlA70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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