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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fa4138160270aef6d94cdc67eb9f97206e640aabd1c00c1a475bcd36273ba8' 
  AND token = '3ahpXwkgbZ4PNN7W6xFmMK2RoAtJ0Ez3UciLzsYd0y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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