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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85aa91d358110db7abe802d3a5a94bfc31285310a16a7dde1251c049a919c1a' 
  AND token = 'HE85RHInaDbQne0LD5KjZEl0ffAcoo9lu7SDQQ/CRGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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