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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2558c661c4ce3cd88fe0cf4a326487c30fb184d0118147bb1160bae86a6fbca' 
  AND token = 'H3HrvMSlx/7g+sykapJ/vQ26Oio8T+G978x0QZxBPzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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