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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0a416791ab7cf5fbd32eb57e6b55c4530c65b235329952ab827df84845b4c9' 
  AND token = 'ncF1E8bvzf/m99j6tSVbMgS2vsbg06I7qldS13TuBN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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