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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366c774a64fe39c8d5ca6738a4e4e9f63f009a7197e993cb33e3554ad04ef6fa' 
  AND token = 'QlVokT6S+nkrO9t5l97BIVQFC6B3RAcJNrwt/fgV/24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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