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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5abfb26b2ac6b346a6a5ac52d7511676ae174e8a927ef1077f63c6d8b3a88de' 
  AND token = 'PUMO+Myetrf47iLBShVnrCNKXFU1vhIYsUTlYehT5gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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