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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632507a59c42453f3cacf3b60d3a986b349c6e1b924c94eb4460c7b480e3e1e1' 
  AND token = 'VOlzh0QbqyWzweXgndpz89NlSRsgFaByVC8q0XnnbEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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