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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015d701808bcdd32f1d2b2bbf97f19f228bf3d7ba4c138c9d08625770175c55d' 
  AND token = 'VHvS57Y29qI7urvJGPcrbT+L6AF/ufsxMkVb+xQqpGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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