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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd02d1f24a4369b30af25d9c13004958ac8145894ad9a8f5e6f66213dd33452' 
  AND token = 'JLCcT6aN1ZYWf1GrU3jq/9X8l5i/gOtFtyEmJdFyOB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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