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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf27ab26a58151dda589016f5a03ba57536d0168174d787a94d60332bf70258' 
  AND token = 'GKFMd6HzYQJCorsyrZzoseap7hCTEfW4K/UrUoiXMuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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