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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d3bd4852045edc1edb0afbc9ae0e8fd76ed0981658ddcc6da379b3b5398f95' 
  AND token = 'edLM8suPCTihDCsfLeV228kf9ysYFJZrLOXqZES2pRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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