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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec1d062c0efc8a04df9a72e2d6811894f9e5bbec679b16ec4c9ee82104cc9e2' 
  AND token = 'SxzRw4IGGMuAFPyoZy+CGm3/WAb1wl6y+Yn69ewXx5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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