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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99e1467b33713351ddf16fd37dd2b73516887066f5818d2762c94317b8e03bf' 
  AND token = 'piikM4FpoZaqC2gpw+yuI2Cu02q7FE4L/ldbjuQCAWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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