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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f5ec15997898c741c78dfc24db2045c29e92c35198cf6dd67ad2d6a25a142a' 
  AND token = 'AZW0ChBi/OlmDSmpczm3r7R01IPgvcXBpa1QBGHQfls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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