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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4806fae2779e4c52baf8fbcd8c4ea6241b3587e67419dbc8d6ce9722def74d2' 
  AND token = 'jrBKGOzMrvircy17CFPmVDGGItsZTWjdGGATiWcXS4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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