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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48e37b280a2869badb360c7b62a299a5a38d1a0f22a0dcccc881cb771e20736' 
  AND token = 'pcT+azTaYU/rZPakbzn6KUiQKRZ6PNqY9X6/Nl/ZsNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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