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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfe0363942152803b4967a378edefcd0bedb5b4ee72183390102e94f3eb5f9a' 
  AND token = 'RhVKAEfZLl3fYsl1dxAsnix/fQeR5gkrd+UTeKf3s2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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