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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6587325db7d2bd15b8c7e53195ec1cc938a1342a076394ddae4396bb92cc8bfc' 
  AND token = 'lr000/ZHn69ReB4QNufcqSl7g61nTV7EWPXNeP+UvYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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