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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fef9ff6b0d7f06d05be4a9e25706eca01e22e4456ee7411b565c69c9cc0e7c5' 
  AND token = 'JrhKtj+9MOyFQvEfb0Ssksm0zyVmJQGOjgCS8mT3Q7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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