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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3811917ad5c446127c296b1ebb6527dd1a798db76925e61c9511501d365f0ca6' 
  AND token = '5lI3+P3Qfjo8bfP1Ng2dH4pkSrYbDmVTkXo9HlCE1ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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