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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfeac93f00e422f6ce894671f7c7d89661665c6b5dc36eb7f8190f87066b1357' 
  AND token = 'r+9RPG2rxcdyWkOqDpBlqHyTTgRGTPzJAIr5TAGrjAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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