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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a83fc5ae3f581b525da03e19cfcebf6e03893800aa0764b3eedb9f4c4ac7f7' 
  AND token = 'YNDRC1Fn1/Sh4n6uevboTgpxu8FLnXknKgpuMAlsvOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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