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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d8a08e406033270bf930882978e98f7b4dea9a244af62836188bfc7b925c87' 
  AND token = '8aiOEbQxyTGdO886YISIQ1aJGV+45aoKEHV9nSUrZYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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