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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82199d149e9a303dc700cc0698210ca327049667e6ad99d5eba7173965721103' 
  AND token = 'oZ5r7YTEiwcq8rx+Hhtm64z85PX1t5gpR87lYJymIaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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