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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872aa5f605b8ea90cb106b1e160861e9f31f8141077dc737db7f8b12671ea29a' 
  AND token = 'reFSZv/3kZRJYp+y0DFYU/ZGAv/tFjYU7IrSSWJkITI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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