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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f797f1af8902df233bd2d6213b88a7fbc0d3573f9c10d89ee1647a0c7e8cbcd6' 
  AND token = 'MOh+1WcFnG0togqVRWwYn4I9i7P0P9VbhsotrVU4Ud0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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