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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbe13eee6f2863be6898ec446374af6b9afbc44a4b41b8a7a1cfe7d02b2df54' 
  AND token = 'q6zId2soiaAfsiphFg/NW+s4BgdzH7SNSua5XzByLx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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