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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26157de9843cef51552b9a8de9f1797cf4eba91255114b198ee6c0ca0618bb03' 
  AND token = 'bzdKRU1eKy5t8qeMxK7wZ6Kejv554NE1EOdbO6TlDbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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